Association between tear film break up time and blink interval in visual display terminal users

Miki Uchino
Motoko Kawashima
Yuichi Uchino
Kazuo Tsubota
Norihiko Yokoi

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Publication date

October 2018

DOI

10.18240/ijo.2018.10.18

Publisher

Press of International Journal of Ophthalmology (IJO Press)

Journal

International Journal of Ophthalmology

Abstract

AIM: To investigate the association between tear film break up time (TBUT) and blinking interval in visual display terminal (VDT) users. METHODS: Nine hundred and thirty VDT users underwent dry eye testing, and functional visual acuity (FVA) test. The blinking interval during FVA was compared with TBUT. Subjects with longer blinking interval than TBUT were considered as unstable tear film. Logistic regression analysis revealed the risk factors for unstable tear group. RESULTS: Among 930 workers, 858 subjects (92.3%) participated in this study. Almost 80% of the subjects were categorized into the unstable tear group. Unstable tear group has significantly lower Schirmer values and TBUT (17.5±11.6 vs 21.1±11.5 mm, 3.7±2.6 vs 5.7±2.7s, both P...